>>> a=["b","c","t","y","b","b","b","b"]
>>> a
['b', 'c', 't', 'y', 'b', 'b', 'b', 'b']
>>> for i in a:
        a.remove("b")     # why can't i remove all the "b" from list a?


>>> a
['c', 't', 'y', 'b']       # this is the result after the for cycle
>>> a.remove("b")
>>> a
['c', 't', 'y']        # i need to remove the last "b" a second time
>>>
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